Slide fastener



Feb. 19, 1946.

v. CIZEK SLIDE FASTENER Filed Aug. 27, 1943,

relented Feb. it, rose UNITED .STA

s ATENT.

' asses-1e suns rssrsnnn Vojtech Cizck, Astoria, Long Island, N. Y assignor to Waldes Koh-I-Noor, Inc Lo Island City, N. Y., a corporation of New ng York Application August 27, 1943, Serial No. 500,246 3 Claims. (on. ae-zos) at right angles to the plane of the stop body and are caused by pressure to pierce the tapes behind the edge beads thereof, being thereupon folded over the beads, orthey are provided at their side edges with securing jaws, similar to the securing jaws with which the fastener elements themselves are conventionally provided, which are clamped around the tape beads.

While the first type of bridgetop stop referred to is simple in manufacture, it is open to, the objection that the securing tongues in piercing the tapes cause weakening thereof, particularly in the case of heavy-duty slide fasteners of large dimensions, in which the impact forces exerted by the slider on the bridge top stop are rela-- tively great. Bridge top stops of the second type present dimculties in manufacture, particularly as respects the Jaw-like securing means with which they are provided. Furthermore, the gripping effect in the longitudinal direction of the slide fastener provided by such securing means may not be suclently great in relation to the impact forces to which bridge top stops of large slide fasteners are exposed, to enable such a top stop to withstand these forces.

' The invention aims to provide an improved bridge top stop of rigid and sturdy construction which overcomes the noted objections to prior types of bridge top stops, which can be manuiactured in a simple stamping operation, and

which can be securely attached to the tape beads by simple pressure exerted on integral gripping tongues formed thereon and which extend at an angle from the body of thestop. The invention moreover provides an improved bridge top stop capable oi gripping the tape beads with a force which in crosswise direction is at least as great as that exerted by bridge top stops provided with Jaw-like securing means and whose gripping force in lengthwise direction is remarkably high, due

to the wave-like bending of the tape beads which it eflects on attachment thereto.

is illustrated an detail.

In the drawing: Fig. 1 is a plan view of the upper or closing end of a slide fastener provided with a bridge top sto in accordance. with the invention, the slider. bein embodiment of the invention in shown as spaced relatively downwardly from the Iii hit

Other objects will be in part obvious and in t p s p;

Fig. 2 isa section taken along line 22 of Fig. 1;

Fig. 3 is a plan view of the metal blank from which the top stop illustrated in Fig. 1 is formed. Referring to the drawing, wherein like referencecharacters designate like parts throughout the several views, the slide fastener illustratedln Fig. 1 is of conventional construction and comprises tapeso'r stringers In, H of extended length having edge beads l2, i3,,-to which are secured rows or chains of.oppositely disposed fastener elements Hi, It. As is well understood, the oppositely disposed fastener elements i i, it of the chains thereoiare adapted to be meshed and unmeshed by a slider it which, as shown, is of the type having a Y-shaped race or channel adapted to dispose the disengaged elements fanwise upon their exit from the slider.

A bridge top stop it forming the subject-matter of the present invention is associated with the tapes Hi, i l adjacent the relatively upper ends thereof to provide a stop which limits movement of the slider it in closing direction. The bridge stop according to the invention comprises a rigid bridge-like body part it provided along both the sides thereof with outwardly projecting and vertically spaced prongs ii, 22, and 2|, 22', respectively, which are disposed substantially in the plane of the body. Between the spaced prongs 2!, 22, and 2i, 22', and offset to the plane of said prongs are arranged tongues 23, 23 which function in the manner of movable clamping jaws to clamp the tape beads l2, l3, against the rigid posed laterally of the longitudinal centerline of the blank, Preferably, the length oi the tongues 23, at is somewhat greater than the length of the prongs related thereto, thus to provide the extra-length required in the subsequent bending thereof. At their free ends the prongs 2 I, 2 i and 22. 22' may be provided with flanges 24, 24', 25,

respctively, (Fig, 3)' which, by reference to Fig. 2, extend from the under face of the prongs and are of length to engage against the relatively upper face of thetapes, while gripping behind the tape beads I2, 13. As shown, the upper and lower edges of the-blankmay be struck on an arc of relatively longradius to provide. syln- -metrically curved'edge portions 21,28.

Following the blanking-out operation the tongues 23, 23", of the blank are offset rearwardly from the plane of the stop body 20, as indicated in dotted lines, Fig. 2, wherein the tongues are shown as bent substantially at right angles to the stop body.- Accordingly, the tape beads may be readily inserted in the angular corner provided between the under faces of the prongs 2'8, 22, and 2i, 22', and the relatively outer faces of the onset tongues. To attach the top stop to the tapes, the tongues are 'bent relatively for.

asaas'zo,

moreover achieves the desirable objective that.

' when attached to the tape beads, it is capable of force required to withstand lateral or crosswise wardly over the tape beads so that'in final assembly they curve over the beads generally as shown in Fig. 2 and their ends terminate sub stantially in the plane'of the prong-end fianges 24, 25. Accordingly, not only are the tape beads clamped between the prongs ti, 22, and ii, 22, I

from the one side, and the tongues from the opposite side, but they are also gripped from behind by the prong flanges and the intermediate tongue ends. By exerting such bending pressure on the tongues as to cause the tape beads engaged thereby to move into the space between their related prongs, the tongues not only function to clamp the tape beads against the prongs, but also cause the engaged portions of the beads to bend to a wave-like formation, as indicated generally in Fig. 2. Accordingly, the gripping force exerted by the top stop as aforesaid on the tape beads in lengthwise direction of the slider is remarkably high, and is measurably greater than the gripping force exerted by prior top stops. Hence, a

top stop according to the invention is capable of withstanding the impact forces exerted thereon by the slider as the latter is moved tofastener closing position, which is oi particular advantage in the case of heavy-duty slide fasteners of large dimensions. Moreover, due to the bending of the tongues-as described over the tape beads, taken with the action of the prong flanges 2d, 25, the crosswise gripping force exerted by the top stop on the tape beads is at least as great as that provided by top stops of prior construction.

From the above analysis, it will be appreciated M and flanges.

that a top stop according to the invention can withstanding the high impact forces exerted by. the-slider thereon as the latter is moved to its fastener closing'position. while at the same time it grips the tape beads. with suflicient gripping stresses to which it is subjected.

As many changes could be made in carrying out the above constructions without departing from the scope of'thejinvention, it is intended that all matter contained in the above description or shown in the, accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

I claim:

1, A bridge top stop for a slide fastener assembly comprising a bridging body portion provided at each side thereof with spaced outwardly projecting and rigid prongs containeclin the plane i of the body portion and with an outwardly projecting tongue disposed intermediate said prongs,

said tongues being ofiset along their lengths from the plane of the body portion and prongs and being operative to provide movable clamp jaws coacting with said rigid prongs.

2. A bridge top stop tor a slide fastener assembly comprising a bridging body portion provided at each side thereof with spaced outwardly projecting and rigid prongs contained in the plane or the body portion and with an outwardly projecting tongue disposed intermediate said prongs, said tongues being ofiset along their lengths from the plane of the body portion and terminating in ends which are disposed substantially in the plane of the prong ends.

3. A bridge top stop for a slide fastener assembly comprising a bridging body portion provided ateach side thereof with spaced outwardly projecting and rigid prongs contained in the plane of the body portion and'with an outwardly projecting tongue disposed intermediate said prongs, said prongs terminating in flanges extending in the same direction outof the plane of the prongs, and saidtongues being offset from the plane of the body portion and prongs and having curva ture along their lengths such that their ends terminate substantially in the plane of the prong- 

